<template>
  <div class="upload-file">
    <el-upload
      :action="isUploadLicense ? uploadLicense : uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :limit="limit"
      v-loading="loading"
      element-loading-text="加载中"
      element-loading-spinner="el-icon-loading"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
      ref="upload"
    >
      <!-- 上传按钮 -->
      <el-button size="mini" type="primary">{{ btnTxt }}</el-button>
      <!-- 上传提示 -->
      <div class="el-upload__tip" slot="tip" v-if="showTip">
        请上传
        <template v-if="fileSize">
          大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </template>
        <template v-if="fileType">
          格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        的文件
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group
      class="upload-file-list el-upload-list el-upload-list--text"
      name="el-fade-in-linear"
      tag="ul"
    >
      <li
        :key="file.uid"
        class="el-upload-list__item ele-upload-list__item-content"
        v-for="(file, index) in list"
      >
        <el-link :href="file.url" :underline="false" target="_blank">
          <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
        </el-link>
        <div class="ele-upload-list__item-content-action">
          <el-link :underline="false" @click="handleDelete(file)" type="danger"
            >删除</el-link
          >
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

export default {
  props: {
    // 值
    value: [String, Object, Array],
    limit: {
      type: Number,
      default: 1,
    },
    //是否限制文件大小
    noResfileSize: {
      type: Boolean,
      default: true,
    },
    isUploadLicense: {
      type: Boolean,
      default: false,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    plain: {
      type: Boolean,
      default: false,
    },
    btnTxt: {
      type: String,
      default: "上传附件",
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      default: () => ["doc", "xls", "ppt", "txt", "pdf", "png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      loading: false,
      uploadFileUrl: process.env.VUE_APP_BASE_API + "/file/upload", // 上传的图片服务器地址
      uploadLicense: process.env.VUE_APP_BASE_API + "/file/uploadLicense",
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
    };
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
    // 列表
    list() {
      let temp = 1;
      if (this.value) {
        // 首先将值转为数组
        const list = Array.isArray(this.value) ? this.value : [this.value];
        // 然后将数组转为对象数组
        return list.map((item) => {
          if (typeof item === "string") {
            item = { name: item, url: item };
          }
          item.uid = item.uid || new Date().getTime() + temp++;
          return item;
        });
      } else {
        this.fileList = [];
        return [];
      }
    },
  },
  methods: {
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      // 校检文件类型
      if (this.fileType) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        const isTypeOk = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
        if (!isTypeOk) {
          this.$message.error(
            `文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`
          );
          return false;
        }
      }
      // 校检文件大小
      if (this.fileSize && this.noResfileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.loading = true;
      return true;
    },
    // 文件个数超出
    handleExceed() {
      this.loading = false;
      this.$message.error(`文件个数超出限制`);
    },
    // 上传失败
    handleUploadError(err) {
      this.loading = false;
      this.$message.error("上传失败, 请重试1");
    },
    // clearFile(){
    //   this.$refs.upload.clearFiles()
    // },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      this.loading = false;
      if (res.code == 200) {
        if (this.isUploadLicense) {
          this.$emit("setFile", res);
        } else {
          this.$message.success("上传成功");
          this.$emit("setFile", res.data.url, this.getFileName(res.data.url));
        }
      } else {
        this.$message.error("上传失败, 请重试");
        // 要清除组件本身选中的文件，影响limit
        let uploadFiles = this.$refs.upload.uploadFiles;
        let index = uploadFiles.indexOf(file);
        uploadFiles.splice(index, 1);
      }
    },
    // 删除文件
    handleDelete(file) {
      // 要清除组件本身选中的文件，影响limit
      let uploadFiles = this.$refs.upload.uploadFiles;
      let index = uploadFiles.indexOf(file);
      uploadFiles.splice(index, 1);
      this.$emit("delFile", file);
    },
    // 获取文件名称
    getFileName(name) {
      if (name.lastIndexOf("/") > -1) {
        return name.slice(name.lastIndexOf("/") + 1).toLowerCase();
      } else {
        return "";
      }
    },
    clearFiles() {
      this.$refs.upload.clearFiles();
    },
  },
  created() {
    this.fileList = this.list;
  },
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>